A 35-year-old woman undergoes cystectomy for an 8 cm unilateral ovarian mass. Histology shows a mucinous tumor with stratification, nuclear atypia, and no stromal invasion. Which term best describes this entity?

• A Mucinous cystadenoma
• B Pseudomyxoma peritonei
• C Mucinous cystadenocarcinoma
• D Borderline mucinous tumor ✓

Explanation

Mucinous tumors with epithelial stratification and atypia but no stromal invasion are classified as borderline (atypical proliferative) tumors. Absence of invasion distinguishes them from cystadenocarcinoma. Pseudomyxoma peritonei is a clinical complication, not a primary ovarian histology. The key discriminator is the lack of stromal invasion despite cytologic atypia.

Reference: Robbins and Cotran Pathologic Basis of Disease, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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